I find the 75% of respondents claiming to use frontend unit tests surprising, in many cases where I could find the time to actually write tests for frontend it was almost exclusively for design system components and those projects are rare
I'm wondering the same. The respondents' demographics hint at that this is a severely skewed sample (2nd largest identifiable nationality is Polish). Anecdotically: the frontend devs I have access to either have a strong engineering discipline or read so little tech on the internet that they couldn't possibly be aware of this survey.